Her husband often criticizes her body and has recently had many strange expressions, afraid of having an affair, so Ichiki decided to go for a breast augmentation to hold on to this husband who is about to change her mind. However, when the breast augmentation was successful, the husband did not even have time to look at it, but he was enjoyed by his lucky brother-in-law first. Due to a business trip away from home, only his wife and brother were left to visit for a few days. That's why the day she went for breast augmentation was enthusiastically picked up by her brother-in-law, and that evening the two began to drink wine to celebrate. There was a drunken yeast in his body and saw his sister-in-law's extremely attractive round breasts, the brother-in-law couldn't control himself, he constantly massaged the big breasts and then caressed her dripping pussy. That night they crossed the line between brother-in-law and sister-in-law, both of them sneaked clumsily behind the back of the ill-fated husband.